The adsorption of N 2 on close-ended single-walled carbon nanotube bundles was studied at different temperatures ranging from 81 to 94 K. The isosteric heat of adsorption was obtained from the adsorption isotherm measurements, and the binding energy of N 2 was estimated from the isosteric heat of adsorption data in the low-coverage region. The estimated binding energy was about 86 meV, and this value lies between those of Ne and CH 4 on nanotube bundles. It was also observed that the isosteric heat of adsorption increased in regions of low coverage and decreased as the coverage increased. This was due to both interactions between N 2 molecules and the heterogeneity of the nanotube bundles.
The adsorption of Ar on open-ended single-walled carbon nanotube bundles was studied. The amount of
argon, which corresponds to the first coverage adsorbed on open-ended carbon nanotube bundles, was about
3 mmol/g. The isosteric heat of adsorption was obtained from the isothermal adsorption measurement in the
low coverage region performed at temperatures ranging from 120 to 135 K. The estimated heat of adsorption
of argon in the low-coverage region was 182 meV and was comparable to that of nitrogen.
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